Key Colony is the largest oceanfront condominium community on Key Biscayne — four buildings on one campus, roughly 1,200 residences, and a beachfront that stretches the length of it. Key Colony Key Biscayne condos for sale span an enormous range, from modest interior units to fully reimagined oceanfront residences. Which building you buy in, and which line, changes the entire proposition.
The Four Buildings
Key Colony was built between 1979 and 1981 and is organized as four distinct condominium communities on a shared oceanfront site:
- The Tidemark — Key Colony I
- The Oceansound — Key Colony II
- The Emerald Bay — Key Colony III
- The Botanica — Key Colony IV
Each has its own association, its own board, its own reserves and its own assessment history. That last point is the one buyers most often miss: "buying at Key Colony" is not a single decision. You are buying into one specific association, and its financial condition is not your neighbor's.
My read, from touring all four: they do not feel the same. Ceiling heights, layouts, renovation levels and the way each building addresses the ocean vary meaningfully. Clients who tour only one building and decide Key Colony "isn't for them" have, in my experience, usually toured the wrong one.
What It Costs
Public data as of March 2026 reported 36 Key Colony condos trading over the prior year, with an average asking price near $1.4M and an average sale price near $1.32M. Active listings across the community have been cited spanning roughly $889,000 to $5.75M, depending on building, line, floor and renovation.
For context, the broader Key Biscayne market has been reported at a median near $1.9M with an average sale price near $2.63M as of March 2026.
All figures come from public portal and brokerage sources as of mid-2026. Confirm against the MLS — and confirm each building's financials directly with its association.
Key Colony at a glance | Detail |
|---|---|
Price range (public sources, mid-2026) | Actives cited ~$889K–$5.75M; trailing-year sale average cited ~$1.32M |
Buildings | Tidemark (I), Oceansound (II), Emerald Bay (III), Botanica (IV) |
Built | 1979–1981 |
Position | Oceanfront, Crandon Boulevard, Key Biscayne |
Amenities | Beachfront, pools, tennis, on-site management (varies by building) |
Structure | Four separate condominium associations |
Trailing-year volume (cited) | ~36 sales |
Location advantage | Island living, minutes to Crandon Park and the Village |
See What's Available Across All Four
Because each building lists separately, most buyers never see the whole campus at once.
Give me your email and I'll send you every current Key Colony listing — all four buildings, plus anything being shown quietly.
The Question That Matters Most: Reserves and Assessments
Buildings of this vintage in coastal Florida are now operating in a very different regulatory and insurance environment than the one they were built into. Milestone inspection requirements, structural integrity reserve studies and rising insurance costs have reshaped condo economics across the state — and a 1979–1981 oceanfront building is precisely the profile where this shows up.
Do not skip this. For any unit you consider, I request:
- The milestone inspection status and report
- The structural integrity reserve study and current funding level
- The past several years of budgets and assessment history
- Any pending or approved special assessment
- The building's insurance placement and current premium trend
A unit priced $200,000 below its neighbor is not a bargain if the building has an eight-figure assessment ahead of it. It also is not automatically a problem — sometimes the assessment is already funded and the discount is real. The only way to know is to read the documents, and I read them.
Why I push hard here: I spent a decade consulting for Miami developers and working construction on luxury waterfront estates before I sold real estate. I know what a concrete restoration on an oceanfront building of this era actually costs and how long it takes. When I read a reserve study, I am reading it as someone who has been on that scaffold.
What Drives Price Between Units
Line and view. Direct ocean, oblique ocean, and interior are three different products at three different prices. The building's brochure will not make this obvious; the floor plan and a site visit will.
Floor. Height matters here, both for view and for the sound of the beach.
Renovation level. The gap between an original 1980 interior and a full contemporary gut is the single widest variable in the community, and it is often larger than the view premium.
Building. Tidemark, Oceansound, Emerald Bay and Botanica do not trade in lockstep. Compare within a building first, then across.
Association health. Two identical units in two different Key Colony buildings can carry very different long-term costs. Price the association, not just the apartment.
Living on the Key
Key Biscayne is an island reached by one causeway, and that single fact shapes daily life more than any amenity list. The village is small and self-contained. Crandon Park and Bill Baggs bookend the island with beach, trail and tennis. The commute to Brickell is short in the morning and occasionally not short at all — ask any islander about a Sunday afternoon in season.
For Key Colony owners specifically, the beach is the front yard. That is the whole proposition. You walk out, and you are on sand. Very few Miami condominium communities at this price point can say the same, and none of them are on Key Biscayne.
One practical note I give every island buyer: budget for the causeway. Not in dollars — in minutes, and in the way it changes how often you leave. The people who love Key Biscayne are the ones who stop leaving.
How I'd Approach an Offer
Start with the association, not the apartment. Once you know which of the four buildings you are comfortable underwriting, the unit search becomes straightforward: pick the line, pick the floor, then price condition.
Sellers at Key Colony are a mixed group — long-held owners, estates, and seasonal owners recalibrating. That variety means motivation genuinely differs listing to listing, and it is knowable. I ask. The answer routinely changes the offer.
And on price: in a community with roughly three dozen trades a year, there is a real comp set. Use it. This is one of the few Miami communities where a data-driven number is actually defensible.
Who Key Colony Suits
The buyer who wants oceanfront Key Biscayne with real amenity and real beach, and is willing to do the association homework to get it at a price the newer buildings cannot touch. It is not a brand-new tower and it does not pretend to be. What it is, is beachfront on an island, at a per-square-foot number that still makes sense — provided you buy the right unit in the right building.
If you want a newer, service-forward product, look at the Ocean Club or the island's newer oceanfront inventory. I'll show you both and let the numbers speak.
Frequently Asked Questions
How many buildings are in Key Colony? Four: the Tidemark (Key Colony I), the Oceansound (II), the Emerald Bay (III) and the Botanica (IV), built between 1979 and 1981.
Are the four Key Colony buildings one association? No. Each is its own condominium association with its own board, budget, reserves and assessment history. Diligence must be done building by building.
What do Key Colony condos sell for? Public sources cite a trailing-year average sale price near $1.32M with active listings roughly between $889,000 and $5.75M as of mid-2026. Confirm current figures against the MLS.
What should I check before buying at Key Colony? The milestone inspection, the structural integrity reserve study, the assessment history, any pending special assessment, and the building's insurance trend. In a 1979–1981 oceanfront building, these determine your true cost of ownership.
Want the current Key Colony list across all four buildings? Send me your email and I'll send it, along with what I know about each building's assessment picture.
Chanel Hunter Milian at Douglas Elliman. License #3302916. Equal Housing Opportunity.
